add ddns log file symbol link

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
add gitlab configure

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
add nginx configure

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
add config/README.md

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>